Effects of blade stagger angle adjustment on the flow and noise of a counter-rotating fan

IF 6.7 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of building engineering Pub Date : 2025-04-11 DOI:10.1016/j.jobe.2025.112638

Zhang Longxin

{"title":"Effects of blade stagger angle adjustment on the flow and noise of a counter-rotating fan","authors":"Zhang Longxin","doi":"10.1016/j.jobe.2025.112638","DOIUrl":null,"url":null,"abstract":"<div><div>To improve the performance of a counter-rotating fan (CRF) installed in an outdoor unit of centralized air conditioner with the complicated inflow condition, a parameter study on the blade stagger angle (BSA) of the forward and rear rotors is performed. 9 BSA schemes are designed with an angle variation from −4° to 12°. Both experimental test and Delayed Detached Eddy Simulation (DDES) are conducted to analyze the influence of BSA adjustment on the flow structures and noise features of the CRF. As a result, the blade leading edge pressure fluctuation is weakened effectively by means of increasing the forward and rear rotors BSA properly, and lower fan noise can be achieved. While once the BSA exceeds the optimal value, the fan noise would be increased due to the enhanced pressure fluctuation induced by the suction side flow separation and tip leakage flow in the rear rotor. In this study, as the BSA of the forward and rear rotor are increased by 6° simultaneously, the fan noise reduction is most prominent, and the overall sound pressure level is lowered by 1.56 dB(A).</div></div>","PeriodicalId":15064,"journal":{"name":"Journal of building engineering","volume":"106 ","pages":"Article 112638"},"PeriodicalIF":6.7000,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of building engineering","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2352710225008757","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CONSTRUCTION & BUILDING TECHNOLOGY","Score":null,"Total":0}

引用次数: 0

Abstract

To improve the performance of a counter-rotating fan (CRF) installed in an outdoor unit of centralized air conditioner with the complicated inflow condition, a parameter study on the blade stagger angle (BSA) of the forward and rear rotors is performed. 9 BSA schemes are designed with an angle variation from −4° to 12°. Both experimental test and Delayed Detached Eddy Simulation (DDES) are conducted to analyze the influence of BSA adjustment on the flow structures and noise features of the CRF. As a result, the blade leading edge pressure fluctuation is weakened effectively by means of increasing the forward and rear rotors BSA properly, and lower fan noise can be achieved. While once the BSA exceeds the optimal value, the fan noise would be increased due to the enhanced pressure fluctuation induced by the suction side flow separation and tip leakage flow in the rear rotor. In this study, as the BSA of the forward and rear rotor are increased by 6° simultaneously, the fan noise reduction is most prominent, and the overall sound pressure level is lowered by 1.56 dB(A).

查看原文本刊更多论文

叶片错开角调整对对转风机流量和噪声的影响

为提高集中空调室外机对转风机在复杂入流条件下的性能，对前、后转子叶片错开角进行了参数研究。9种BSA方案的设计角度从- 4°到12°不等。通过实验测试和延迟分离涡模拟（DDES）分析了BSA调整对CRF流动结构和噪声特性的影响。结果表明，通过适当增大前、后转子BSA，可以有效地减弱叶片前缘压力波动，降低风机噪声。而一旦BSA超过最优值，则由于吸力侧流分离和后转子叶尖泄漏流引起的压力波动增强，导致风机噪声增大。在本研究中，当前后转子BSA同时增大6°时，风机降噪效果最为显著，整体声压级降低1.56 dB(A)。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Journal of building engineering Engineering-Civil and Structural Engineering

CiteScore

10.00

自引率

12.50%

发文量

1901

审稿时长

35 days

期刊介绍： The Journal of Building Engineering is an interdisciplinary journal that covers all aspects of science and technology concerned with the whole life cycle of the built environment; from the design phase through to construction, operation, performance, maintenance and its deterioration.